Authenticated memory corruption via L2TP Host Name AVP
Published Sep 8, 2026 · Updated Sep 8, 2026
Out-of-bounds write in the D-Link DIR-822A A_101 L2TP Control Message Parser allows remote authenticated users to corrupt memory. The tunnel_set_params function mishandles a crafted L2TP Host Name AVP and writes beyond an intended buffer, although the disclosure omits the exact copy or length calculation. Low-privileged network access to the L2TP service is required; the published evidence does not establish code execution or a specific crash mode.
Summary
What happened
Out-of-bounds write in the D-Link DIR-822A A_101 L2TP Control Message Parser allows remote authenticated users to corrupt memory. The tunnel_set_params function mishandles a crafted L2TP Host Name AVP and writes beyond an intended buffer, although the disclosure omits the exact copy or length calculation. Low-privileged network access to the L2TP service is required; the published evidence does not establish code execution or a specific crash mode.
The record
- CVE
- CVE-2026-86510
- Published
- Sep 8, 2026
- Updated
- Sep 8, 2026
- Vendor
- D-Link
- Product
- DIR-822A
- Classifications
- CWE-787, CWE-119, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=A_101
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- D-Link DIR-822A L2TP Host Name AVP Out-of-Bounds Writeproof of concept · unverified
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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